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Add 7/8 and 21/30

7/8 + 21/30 is 63/40.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 8 and 30 is 120

    Next, find the equivalent fraction of both fractional numbers with denominator 120
  2. For the 1st fraction, since 8 × 15 = 120,
    7/8 = 7 × 15/8 × 15 = 105/120
  3. Likewise, for the 2nd fraction, since 30 × 4 = 120,
    21/30 = 21 × 4/30 × 4 = 84/120
  4. Add the two like fractions:
    105/120 + 84/120 = 105 + 84/120 = 189/120
  5. 189/120 simplified gives 63/40
  6. So, 7/8 + 21/30 = 63/40
    In mixed form: 123/40

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